Derrick for loading or unloading vessels.



Patented Nov. 25, I902.

No. 7l4,328.

N. E. PORTER.

DERRICK FOR LOADING 0R UNLOADING VESSELS. (Application filed July 21, 1902. (No Model.) 4 Sheets-Shee:i l.

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No. 7|4.328. Patented Nov. 25, I902. N. E. PORTER.

,OEBRIGK FDR LOADING 0R UNLOAD ING VESSELS.

A ucazion filed July 21, 1902.

.(No llddal.)

4 Sheetg-Sheoi 2.

"0.714328. Patented Nov. 25, I902 N. E. PORTER. DERRICK FOR LOADING 0R UN'LOADING VESSELS.

(Application filed Jul -'21. 1902.) (No MndelL) 4 Sheets-Shae! 3.

No 714.328. 1 Patented Nov. 25,1902.

u. E; PORTER. DERRICK FOR LOADING 0B UNLDADING VESSELS.

(Application filed July 21.1902.

(N6 Model.) 4 Sheets-Shoat 4.

UNITED STATES ATENT OFFICE.

NICHOLAS ELLIS PORTER, OF LONDON, ENGLAND.

DERRICK FOR LOADING OR UNLQADING VESSELS.

SPECIFICATION forming part of Letters Patent No. 714,328, dated November 25, 1902,

Application filed July 2i, 1902. Serial No- 1l6|374- (N l-l To all whom it mag concern:

Be it known that I, NICHOLAS ELLIS POR- TER, marine surveyor, a subject of the King of Great Britain, residing at 101 Leadenhall street, in the city of London, England, have invented a-certain new anduseful Improvement in Derricks for Loading or Unloading Vessels,of which the following is a specification.

In derricks as now usually constructed the derrick-boom is at its feet end jointed to a vertical pivot-pin, which can be dropped into a socketsecured to the side of the mast or to a table or support extendingaround the mast. Usually three such sockets are provided, one on either side of the mast and the third in the same longitudinal line as the mast. It is undesirable that the derrick-booms should be heavier than is necessary for being used when raising a load of usual weight; but occasionally much heavier weights have to be lifted in or out, and to provide for this a special derrick-boom of two, three, or more times the strength of other booms has had to be provided, and a specially strong sockethas had to be secured to the deck for receiving its pivot-pin. These special heavy spare derrick-booms are costly, and owing to their weight are difficult to handle, and when out of use and stowed away on the deck are always in the way, and being only wanted onrare occasions entail loss of carrying power to the ship. To avoid the necessity of providing such a special spare heavy derrickboom for being used when lifting an exceptionally heavy weight, I provide clamps, by I which three of the derrick-booms used when lifting loads of usual weight can be clamped together, so as to form one boom of triangular cross section, and I provide a special gooseneck orpivot-pin, the head of which is so formed that the ends of two of the booms can be jointed'to it. I also provide a specially strong socket for this pivot-pin to be dropped into. This socket may be secured to the deck,

but preferably I secure it to the raised table, which carries the other sockets used. when working with single derrick-booms, additional supports being provided to give the requisite strength to the table. Usually I provide three clamps for clamping together the three booms, two for clamping them together at the ends and the third for clamping them together at the center. Where the three booms are embraced by each end clamp, I place centrally between them a hard wooden block with three faces, each suitably shaped to form a bed for a portion of the circumference of each boom to be held against. Each clamp may be in two parts andthe end portions of the two parts made to lie parallel with one another, so that they may be drawn together by screwbolts. For the upper end clamp two of the ends so bolted together are suitably formed for the upper block of the lifting-tackle or purchase-fall to be carried by them, and the other two ends, which are bolted together, suitably formed for the supporting-tackle to be connected to them. Similarly the other clamps may be made to carry rollers for the lifting rope or chain of the purchase-fall to be led over. Other clamps are also provided to be clamped onto thederrick-booms when the booms are to be used singly and are similarly formed for the lifting and supporting tackle and for guide-rollers tobe carried by them. .In place of clamping three derrickbooms together, as above described, two or other number of booms might similarly be clamped together.

The improvements are shown in the drawings annexed.

Figure 1 isaside elevation of a derrick having abuilt-up boom composed of three lighter booms clamped together, as above described. Fig. 2 is a side elevation, on a larger scale, of the lower end of the built-up boom, with two of the lighter booms of which it is composed jointed to the head of a vertical pivot-pin. Fig. 3 is a section of the same on the line a b, Fig. 2. Fig. 4c is an end elevation of a clamp by which the upper ends of the three light booms are clamped together, the booms being shown in section. Fig. 5 is a side elevation of the same. Fig. 6 is an end elevation of a clamp for clamping together the booms near the center of their length, the booms being shown in section. Fig. 7 is a similar view of a clamp for clamping together the lower ends of the light booms. Fig. 8 is a side elevation of one of the light booms jointed to a vertical pivot-pin when it is to be used singly. Fig. 9 is an end elevation of boom is then embraced and which is adapted to carrya pulley-block for the lifting-tack1e. Fig. 1.0 is an end elevation of a clamp by which the light boom may be embraced at any desired part of its length and adapted to carry a roller for the lifting-chain to pass over.

In Figs. 1, 2, and 3 the socket for receiving the vertical pivot-pin of the heavy built-up boom is shown to be carried bya raised table secured to a mast and supported by strong supports from the shelter-deck and upper deck of a vessel; but the socket might be mounted in any other suitable position.

In Fig. l, A is the shelter-deck; B, the upper deck; 0, a table secured to the mast D. E represents supports for this table, extending upward from the upper and shelter decks.

F is a vertical pivot-pin dropped into a socket formed to receiveit in the table 0. F represents brackets extending upward from the head of this pivot-pin.

Grepresents three light booms clamped together, as above described, to form a builtup boom triangular in cross-section. Each light boom has an eye G secured to its lower end, as usual. The eyes at the lower end of two of these light booms pass into spaces between the brackets F.

H is a horizontal pin passed through the brackets and through the two eyes which lie between them.

I I 1 are clamps holding together the three light booms G. The upper clamp I (shown separately at Figs. 4 and 5) carries a pulley J, serving as the upper pulley of the lifting tackle and a pulley K for the supportingtackle. Parts only of these pulleys are shown in Figs. 4 and 5.

The lifting-tackle and the'su pporting-tackle may be arranged in any desired way. The arrangement shown is a convenient one. The other clamps I I may, as shown, each carry a roller for the lifting chain or rope to pass over. The light booms G being usually of larger diameterat the center than at the ends, filling-blocks L are provided for placing between at the parts where they are embraced by the end clamps, as shown in Figs. 4, 5, and 6.

It in place of the builtup boom being formed of three light booms clamped together it were formed of two or four or other number of light booms, then the form of the clamps would be modified accordingly.

When any one or other of the light booms G is to be used singly, then a clamp, such as shown at Fig. 9, is clamped to its upper end to carry pulleys for'the lifting and supporting tackles. Other clamps, such as shown at Fig. 10, may also be made to embrace any desired parts of the boom to carry rollers for the lifting chain or rope to pass over.

What I claim is- 1. The combination of a vertical pivot-pin, a built-up boom composed of lighter booms clamped together and a horizontal joint connecting the lower end of the built-up boom to the head of the vertical pivot-pin.

2. The combination of a vertical pivot-pin, a built-up boom of triangular cross-section composed of three light booms clamped together and a horizontal joint connecting the lower ends of two of the light booms to the head of the vertical pivot-pin.

3. The vertical pivot-pin with enlarged head having brackets extending from it and spaces between the brackets to admit of eyes on more than one light boom being jointed to them with the joints in line with one another.

4. A built-up derrick-boom composed of lighter booms clamped together, each such lighter boom having a metallic eye fixed to its lower end so that each may be used separately when unclamped from the others.

NICHOLAS ELLIS PORTER.

Witnesses:

CHARLES HUNTER WARD, WILLIAM HoLMEs. 

